Drawing-board apparatus.



No. 647,677. vPatentgd Apr. |7, |900'.-

H. A. LEIGHTON. mzAwma soAnn APPARATUS.

(Appumionmed Aug. 2s, 1899.) (No Model.) 2 sneeuw-sheet l.

42, .40 ,1/-12 Y y ce Patnted Apr. I7, |900. n. A. LEIGHToN. DRAWING BoARD APPARATUS.

(Application led Aug. 25, 1899.)

2 Sheets-Sheet 2.

.(No Model.)

UNITED STATES PATENT OFFICE.

HNRY A. LEIGHTGN, OF WATRTOWN, MASSACHUSETTS.

DRAWING-BOARD APPARATUS.

SPECIFICATION forming part of Letters Patent No. 647,677, dated April 1'7, 1900. Application led August 25, 1899. Serial No. 728,429. (No model.)

To all whom t may concern:

Be it known that I, HENRY A. LEIGHTON, a

citizen of the United States, and a resident of Watertown,county of MiddleseX,State of Massachusetts, have invented an Improvement in Drawing-Board Apparatus, of which the following description, in connection with the accompanying drawings, is a specilication, like letters and gures on the drawings representing like parts.

This invention relates to drawing-boards; and the object of this invention is to provide an improved device of this kind including in its organization certain peculiar features hereinafter more particularly described and claimed.

In the drawings, Figure 1 is a face view of a drawing-board, showing the same as including myinven tion in a convenient embodiment thereof. Fig. 2 is a cross central elevation, the section being taken in the line 2 2, Fig. l, and looking in the direction of the arrow and being upon an enlarged scale. Fig. 3 is a rear view of the board. Fig. 4 is an edge view of the same, the parts broken away. Fig. 5 is a rear View, upon an enlarged scale, of a tension-regulator; and Fig. G is a longitudinal central sectional elevation of said tension-regulator.

The drawing-board includes in its construction a board proper or support B, generally made of wood, and to the plain face of which a sheet of paper or other article may be tacked, and the strips 12, 13, 14, and 15 are secured around the same, the strips 13 and 15, disposed along the sides of said board, being separated from the same by spacing strips or blocks 16 and 17. l

The straight-edge,which may be of any suitable character, is movable along the board from the top to the bottom-thereof and may be maintained in a horizontal position or an` gularly relatively thereto, as may be desired by the user, by the mechanism hereinafter more particularly described.

The straight-edge represented is denoted by S and is made of a suitable width and extends entirely across the face of the board and has the usual upper beveled edge.

The vstraight-edge is connected to the angularly and independently adjustable arms A` and A', which are connected in the present case by an endless band, hereinafter described,which serves to maintain them in fixed relation relatively to each other, and, though it is not essential, I connect both arms to the straight-edge by means which permit the angular adjustment of said straight-edge from either end.

The straight-edge, which tits flatwise against the face of the board or against a sheet of pa- -per thereon, has near its opposite ends the tating which to the right the arms A and A may be clamped in a desired adjusted position, andthe nuts are shown as having slots 26 to receive a Spanner or other suitable tool by which to facilitate the turning of the same,

and their edges are milled, so that they may be more readily turned by hand. The shanks of the screws 22 and 23, which, it is understood, project from the straightedge S and also through the disks 2O and 21 therein, extend upward through to the elongated slots 27 4and 28, disposed longitudinally in the arms A and A. An endless band, as E, is secured in the present case to the outer ends of the two arms, and it travels fora part of its length in the spaces o r grooves 35, located at opposite sides of the board.

In Fig. 1 the straight-edge S is shown as being clamped in a horizontal position in full lines, and as its outer ends are connected to the endless band E it will be understood that the straight-edge can be moved freely up and down the board without changing its'position.

When it is desired to shift the straight-edge to an angular position, the clamping-nuts 24 and 25 will be loosened, so-that either end of the straight-edge may be raised or lowered, and when said straight-edge is in theproper angular position the clamping-nuts' will be tightened to securely hold the same. Then the nuts are thus tightened, it will be evident IOO 50 l end is held in place by the pivot of said le-` V that the straight-edge can be moved up and down the sheet without affecting the adjustment, which is important/in making section.- lines, all of which must be at the same pitch.

The endless band E,to which I have referred and whichl ordinarily consists of thin Wire, passes around `a series of guide-rolls, as 40, having grooved peripheries and located at the corners of the board, and these 'rollers are' supported by brackets, as 4l, secured in slots or openings 42, through which said'band.

edges thereof, and in alinement substantially with the respective rollers 40, disposed upon theupper and lower ends ot the board.

In connection with the endless band I prefer toemploy a tension-regulating device of proper kind which serves to take up any slack that may be in theband.

Thetension device represented is denoted by T, and in the form thereof represented it consists of a lever mounted for swinging movement upon the back of the board in adjacence v vto the band E where the latter crosses the back of said board, as shown clearly in Fig. 3. The tension device T is bifurcated below itsaXis of oscillation, and the branchesor arms thereof have rollers 5l to receive the transverse portion of the endless band E.

The pivotfproperof the tension device T is end adapted to bear against the boss 57 on the segment G. The bushing .passes th rough .the lower end of said segment and its inner `end bears against the washer or wear-plate 58.

The bushing 55, which constitutes the pivot for the part T, is held in place by the screw 59, threaded into the back side of the board and the head of which is countersunk in the bushing. It will be evident that when the lower portionof the lever part T is swung to what is shown as the left in-Fig. 3 any looseness that' maybe in the wire band B will be:

y taken up, so that the latter can be almost ment.

kept taut. The lever T is disposed between the segment Gand the board, and its lower ver, while the screw 60 passes through the L- shaped odset 61 upon the upper side of the vsegment and enters the board. The segmental portion proper of the segment G has the arc-shaped slot 62, through which the screw 63 passes and which is in threadedV engagever` can be moved back and forth to regulate .the tension of the wire band E, and the said lever canbe held in an adj usted position by turning the head of the screw against the seg- When the screw is loosened,its head constitutes a convenient handle for manipulating the take-up lever.

It will be remembered that the endless band E is clamped to the outer ends ofthe two angularly-adjusted arms A andl A. On reference to Fig. 2 it will be Seenth'at the'arm A is provided with a downwardly-extending tubular or bored projection or stud 70, the bore of which alines with an opening in said arm. -This projection,l is disposed inthe right-hand groove or guideway 35 of the board, and the ends of the bands arepassedthrough this `bore and also through the opening inthe arm and along the upper face of said arm and between the washer 7l on the stud 72 and the arm. The clamping-nut is denoted by 73, and it is ,employed'to force the washer 7l firmly against the ends ofthe w1re,tner eby.tohoid 4the .same securely against the said arm. The

arm is provided with a pin`74, extending into a suitable opening in the washer 7l, thereby to hold said washer against turning upon the operation Aof the clamping-nut 73. The lefthand arm A' has also a tubular downwardlyextending projection 75,l the bore vof which alines with the opening in the said-arm and which is adapted to receive thetubular projection 76 upon the traveler 77, consisting of a plate having upturned side walls or flanges in bearing engagement with the'side walls of the left-hand groove or guidewayA 35. Said groove is adapted to receive the shoe or'disk 7 8, connected by the pin 79 with the follower, so that said disk cannot turn when the endless band is clamped. The endless band E is held betweenthe adjacent faces of the follower and the disk and is clamped iirmlyin such position by turning the nut 79', vwhich nut is in threaded engagement with the stud 80, eX- tending upward from the disk 78 and through thetubular portion 76 of thefollower.

The described construction permits the ready adj ustment of the two arms A and A' independently of eachl other or simultaneously with facility and rapidity without moving the wire laterally, as in this case it would be stretched, and also upon the adjustment of either or both .of the arms no kinks or bends can be formed therein. It will also be evident that when the parts are assembled as shown'in the several figures no kinks are present in the wire, as is the case in certain common types of this class of device, and these knots and kinks in the wire, as will be obvious, materially interfere with the proper operation of the appliance.

Having described my invention, what I claim, and desire to secure by Letters Patent,

isl. In a drawing-board, aboard,.a straightedge supported against the board `for sliding movement, and provided with screws extending perpendicularly therefrom, two arms slotted to receive said screws, nuts carried by the screws and serving to bind the arms 'against the straight-edge,and an endlessbandl IOO IIO

IZO

upon the board adjustably connected to said arms.

2. In a drawing-board, an arm having an opening and provided with a bored projection, the bore of which is in alinement with said opening and the bore of the opening being adapted to receive a band, and a clamping device for said band carried by the arm.

3. In a drawing-board, an arm having an opening and provided with a bored projection, the bore of which alines with such opening and the bore in the opening beingadapted to receive a band, a threaded stud upon the arm, awasher on the stud, a nut also upon the stud and a projection carried by lthe arm and extending into an opening in said Washer.

4.V In a drawing-board, an arm having an opening and provided With a bored projection, the bore of which alines with the opening in said arm, a follower having a tubular projection extending into said bore, and a disk having a screw-threaded stem projecting through said tubular projection and provided with a nut engaging the stem.

5. In a drawing-board, an arm having an opening and provided with a bored projection, the bore of which aiines with the opening in said arm, a follower-plate having upturned side Walls or fianges, and also having a tubular projection extending into said bore, a disk provided with a threaded stem extending through the tubular projection, a nut engaging said threaded stem, and a pin upon the disk located to engage the follower.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

HENRY" A. YLEIeI-ITON. 

